Privately owned airports; duty of care of landowners. Limits the liability of owners of private, unlicensed airports that are not open to the public and for use of which no fee is charged to gross negligence or willful or malicious failure to guard or warn against a dangerous condition, use, structure, or activity. Owners are liable for ordinary negligence related to conditions on the premises that proximately cause damage to property or injury to occupants of an aircraft or ultralight vehicle landing on or taking off from such premises.